My slave likes being lightly slapped in the face, and it does give me quite a rush to oblige her! I do it sparingly, and very carefully. I keep it just to her cheek, below the cheekbone, because I don't want to cause any bruises. This also keeps me from accidentally hitting her in the eye. I never slap her very hard, but I don't have to - she likes to close her eyes, so I'll usually surprise her with it. She usually doesn't see it coming, and her reaction is incredible.